Improved extension-ladder



CALVIN G. UDELL, OF CHICAGO, ILLINOIS;

Letters Patent No. 93,502-, dated August 10, 1869.

IMPROVED EXTENSION-LADDER.

The Schedule referred' to in these Letters Patent and making p'art ofthe same.

To all whom it' may concern Beit known that l, CALVIN G. UDELL, ofChicago,

Yin the county of Cook, and State of Illinois, have invented a new anduseful Improvement in Extension- Ladders; and I do hereby declare thefollowing to be a full, clear, and exact description of the same,reference being had to the accompanying drawings, and

the letters and iignres marked thereon, which form a part of thisspecification, in which- Figure 'l representsa front elevation of myladder;

Figure 2, a side view, with the lower ladder in section at the line x,-

Figure 3, a front view of the same ladders placed in the .form of astep-ladder; and

Figure 4, a side vertical sectional view at the liney.

The nature of my' invention consists in providing `an extension-ladderwith irons, C and K, hereafter more fully described, by whichv theladders are held together when used as an extension-ladder, and the topsthereof firmly locked together when converted into a step-ladder.

To enable those skilled in the art to understand how to construct anduse my invention, I willproceed to describe the same with particularity.

The same letters of reference referto correspomling parts in thediii'erent figures.

I make an ordinary ladder, A, with rounds, B, to which, near its top,just below its upper round, I attach a metallic strip, C, said stripbeing. so constructed and attached to the ladder as to admit the ladderD passing-beneath it, and between it and the round of the ladder A. 4

At or near the bottom of the ladder D, I attach the pieces E, withnotches or recesses F, vwhich rest upon the rounds B of the ladder A,and hold the ladder D extended to any desired length. p

The pieces E, with shoulders F, I have heretofore constructed, andtherefore do not now claim `them as new; but I construct said pieceswith openings or recesses H, for the cross-brace I, and said piecesareso ladder D, with a recess, O, in one side thereof, so constructed asto receive therein the said strip C, when the ladder D is close againstthe ladder A; but when the ladders are swung apart, as shown in figs. 3and 4, the said strip Gis locked into the said recesses, and the tops ofthe two ladders are locked together in such a way that they eannotcomeapart or slip. They are prevented from tipping over sidewise by thebrace I,

arranged as above described.

P is a platform, with pieces, Q, ou the under side thereof, in which arerecesses, R, of such shape that they will receive the round of theladder, and when it is swung up into the position shown in iig. 4, it ismade fast on the round, and will not admit of the platform slippingthereon, or coming off from the round, except Aas it is raisedperpendichlarly.

The projection that extends down on one side of the recess R ishook-shaped, so that as a weight is placed uponthe platform P, itpresses the round of the ladder more firmly into said hook, and theplatform is held more securely oh the ladder.

The braces is hinged to the platform, and has a piece, T, attached toitthat passes over a round below the platform, and is fastened thereon bythe pin U.

By this construction and arrangement of the different devices, theplatforml? is securely fastened to the ladder, and can be removedtherefrom only by raising the pin U, and raising one end of the platformso as to raise the piece T from the round on which it rests; then, bymoving the platform back slightly, so as to move the round fromthehookon one side of the recess R, the platform can be raisedjandJraken from the ladder.

By bringing the two ladders together, parallel with each other, thepieces K can be removed from the strips O, and the ladder made into anordinary extenvsion-ladder, or taken apart and used as single ladders.

Having fully described the construction and operation of my improvedladder, l

What I claim, and desire to secure by Letters Pat- I gent, is attachedto the ladder D, that they will swing forward The combination of theladders A. and D, the strip O, and pieces K, for the purpose of lockingthe tops of the ladders together, when used as a step-ladder, whenconstructed and operating substantially as herein set forth.

CALVIN G, UDELL.

Witnesses `J. L. GOBURN, L. L. GOBURN.

